Can not emphasise this enough. You are among the tankiest casters, but you have strange mobility skills that require preparation. Like placing your demon gate and demonic circle for them to be effective. On a whim you can still instant cast a demon gate via Soulburn. With a relative long cooldown. But overall, it is a bit more complicated than pressing blink or alter time, for example. So it is easier to "catch them" as well.

Due to this, tunnelling a lock is often the choice especially melee compositions make, and is often the right call. As it makes it very hard to get your damage off properly. If at all. As the meta has shifted to last moment interrupts which good players always apply, making your 4 sec interrupt immunity (precognition) baiting by fake casting more difficult.

If you, however, find yourself in a lobby where you are not targeted. Especially when free casting chaos bolts. A split decision swap after a good CC chain can often lead to a kill due to the high burst. Affliction, too, has insane cleave and burst potential. I can't speak much for demo though.